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Date: Wed, 18 Apr 2007 19:04:09 +0200
From: J65nko <j65nko@gmail.com>
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References: <20070417145352.M39800@mscc.huji.ac.il>
Cc: Ido Admon <rhingael@mscc.huji.ac.il>
Subject: Re: Execute command upon interface initialization?
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On 4/17/07, Ido Admon <rhingael@mscc.huji.ac.il> wrote:
> Hello list,
> I couldn't find any way to execute an arbitrary command upon network
> interface initialization. My situations is that I have and ethernet card
> that takes DHCP from a cables provider (not a fixed IP address) and I
> need to update a DynDNS hostname everytime it does (everytime the IP
> changes).
> I couldn't find a way to execute shell commands using the rc system or
> dhclient, what did I miss?

You can use a '/etc/start_if.<nic>' file. If your NIC is fxp0 then a
'/etc/start_if.fxp0' file will be run or sourced by the 'rc' system.

In http://www.bsdforums.org/forums/showthread.php?t=34607 this type of
file is used to set a MTU of 1492